THE DESTRUCTION OF AFRICA

The massive scale of environmental devastation across the continent has been fully revealed for the first time in an atlas compiled by UN geographers. Michael McCarthy reports

Nature laid waste

It was long shrouded in mystery, called "the Dark Continent" by Europeans in awe of its massive size and impenetrable depths. Then its wondrous natural riches were revealed to the world. Now a third image of Africa and its environment is being laid before us - one of destruction on a vast and disturbing scale.

Using "before and after" satellite photos, taken in all 53 countries, UN geographers have constructed an African atlas of environmental change over the past four decades - the vast majority of it for the worse.

In nearly 400 pages of dramatic pictures, disappearing forests, shrinking lakes, vanishing glaciers and degraded landscapes are brought together for the first time, providing a deeply disturbing portfolio of devastation.

The atlas, compiled by the United Nations Environment Programme (UNEP) at the request of African environment ministers, and launched yesterday simultaneously in Johannesburg and London, underlines how extensively development choices, population growth, regional conflicts and climate change are impacting on the natural world and the nature-based assets of the continent.

The satellite photos, some of them spanning a 35-year period, offer striking snapshots of environmental transformation in every country.

The purpose of the atlas is to inspire African governments to improve their records as environmental custodians, and as such, its language and tone are studiously neutral, generally referring to environmental "change" rather than destruction. But although there are some examples given of change for the better, the vast majority of the case studies are of large-scale environmental degradation, and the atlas compilers freely accept that this represents the true picture.

They write of "the swell of grey-coloured cities over a once- green countryside; protected areas shrinking as farms encroach upon their boundaries; the tracks of road networks through forests; pollutants that drift over borders of neighbouring countries; the erosion of deltas; refugee settlements scattered across the continent causing further pressure on the environment; and shrinking mountain glaciers."

For its visual impact, the atlas takes advantage of the latest space technology and Earth observation science, including the 36- year-old legacy of the US Landsat satellite programme, demonstrating the potential of satellite data in monitoring ecosystems and changes to them.

The "before and after" shots show vividly just how vast the changes have been, not only since the first Landsat satellite in 1972, but on much shorter timescales. Deforestation is shown not only as mass forest disappearance in countries such as Rwanda, but also as the insidious spread of logging roads through once entirely untouched rainforests in countries such as the Democratic Republic of the Congo, and the replacement of natural forest by bright green rubber and palm plantations in Cameroon.

Urban spread is illustrated not only by the dramatic expansion of the Senegalese capital Dakar over the past half century, from a small urban centre at the tip of the Cape Verde peninsula, to a metropolitan area with 2.5 million people spread over the entire peninsula, but by the rapid development of a small town like Bangassou in the Central Africa republic, now beginning to affect the nearby forest.

Shrinkage of mountain glaciers is shown only in the well-known case of Mount Kilimanjaro, but also in the disappearing glaciers in Uganda's Rwenzori mountains, which decreased by 50 per cent between 1987 and 2003. And to the well-known cases of the drying up of Lake Chad, and falling water levels in Lake Victoria, the atlas adds new cases of disappearing water bodies like the drying up of Lake Faguibine in Mali, as well as many examples of desertification, unsustainable large-scale irrigation and degraded coastal areas.

Put it all together and you have a picture that is hard to credit, so enormous is the destruction. Statistically, the atlas finds that deforestation is a major concern in no fewer than 35 African countries, including the Democratic Republic of the Congo, Rwanda, Nigeria and Malawi, among others. Africa is losing more than four million hectares of forest every year - twice the world's average deforestation rate.

That problem is closely followed in significance by major loss of biodiversity [wildlife] which is occurring in 34 countries, such as Angola, Ethiopia, Gabon and Mali. Land degradation is similarly a major worry for 32 countries, including Cameroon, Eritrea and Ghana, with some areas across the continent said to be losing more than 50 metric tonnes of soil per hectare per year.

The atlas shows that erosion, as well as chemical and physical damage, have degraded about 65 per cent of the continent's farmlands. In addition, slash-and-burn agriculture is adding to the number of wildfires which are naturally caused by Africa's high prevalence of lightning.